K. Backdrafting (Station Wagon Effect)
Backdrafting or the “station wagon effect” is caused .
by.air.movement.over.or.around.a.boat.creating.a.low.
pressure.area.or.suction.area.around.the.stern.that.
can.increase.CO.level.on.the.boat..Backdrafting.can.
be.affected.by.relative.wind.direction.,.boat.speed,.
and.boat.trim.angle..See.Figure.B-9.Backdrafting.-..
Airflows Over Boat and Behind Transom”.
Exhaust Fumes!
Hull exhaust from your boat can cause
excessive accumulation of poisonous carbon
monoxide gas within cockpit areas when using
protective weather coverings (while underway
or while stationary). Provide adequate
ventilation when the canvas top, side curtains
and/or back (aft) curtains are in their closed
protective positions.
Under.certain.speed.and.operating.conditions.the.low.
pressure.area.may.form.in.other.regions.and.permit.
carbon.monoxide.to.enter.the.hull.through.openings.
that.are.not.on.the.back.of.the.boat..Boat.factors.
which.may.affect.CO.concentration:
4..
Opening.and.closing.ports,.hatches,.doors,.and.
windows.may.raise.or.lower.CO.levels.on.board.a.
boat. When airflow is moving forward inside the boat,
CO.may.be.entering.the.boat..See.Figures.B-11..
and.B-12.
Figure B-9: Backdrafting - Air flows over boat
and behind transom.
Figure B-11: Desired air flow through the boat.
1..
2..
Intentional.or.unintentional.excessive.trim.angle.
causing.high.bow.angle..See.Figure.B-10.
Excessive.or.unequally.distributed.weight.
Figure B-12: The effect of canvas configurations.
5..
Operating.a.boat.at.slow.speeds.with.a.following.
wind.should.be.avoided..Consider.changing.
direction,.adjusting.speed,.or.both...
See.Figures.B-13.
Figure B-10: Inefficient trim angles.
3.
Canvas Configurations - Under various conditio-
ns,.adding.or.removing.canvas.may.raise.or.lower.CO.
levels..See.Figures.B-9,.B-10.&.B-12
Figure B-13: Operating at Slow Speed
with Following Wind
Boating Safety - Section B
Owner’s Manual Page
| Categories | Four Winns Manuals, Four Winns Vista Manuals, Outboard Marine Corporation Manuals |
|---|---|
| Tags | Four Winns Vista 348 |
| Model Year | 2005, 2006 |
| Download File |
|
| Document Type | Owner's Manual |
| Language | English |
| Product Brand | Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx |
| Document File Type | |
| Publisher | fourwinns.com |
| Wikipedia's Page | Outboard Marine Corporation |
| Copyright | Attribution Non-commercial |
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